KR100879297B1 - Rechargeabel battery - Google Patents

Rechargeabel battery Download PDF

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Publication number
KR100879297B1
KR100879297B1 KR1020070097307A KR20070097307A KR100879297B1 KR 100879297 B1 KR100879297 B1 KR 100879297B1 KR 1020070097307 A KR1020070097307 A KR 1020070097307A KR 20070097307 A KR20070097307 A KR 20070097307A KR 100879297 B1 KR100879297 B1 KR 100879297B1
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South Korea
Prior art keywords
current collector
protrusions
electrode group
plate
electrode
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KR1020070097307A
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Korean (ko)
Inventor
윤지형
하시모토타츠야
김용삼
유석윤
이치영
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삼성에스디아이 주식회사
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Priority to KR1020070097307A priority Critical patent/KR100879297B1/en
Priority to JP2007312050A priority patent/JP4933411B2/en
Priority to US12/010,555 priority patent/US7887951B2/en
Priority to CN2008100806243A priority patent/CN101399362B/en
Priority to DE602008002980T priority patent/DE602008002980D1/en
Priority to EP08157726A priority patent/EP2043180B1/en
Application granted granted Critical
Publication of KR100879297B1 publication Critical patent/KR100879297B1/en

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/531—Electrode connections inside a battery casing
    • H01M50/538—Connection of several leads or tabs of wound or folded electrode stacks
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/04—Construction or manufacture in general
    • H01M10/0431—Cells with wound or folded electrodes
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10—Energy storage using batteries
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
    • Y02P70/50—Manufacturing or production processes characterised by the final manufactured product

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Connection Of Batteries Or Terminals (AREA)
  • Secondary Cells (AREA)

Abstract

A secondary battery is provided to improve output by comprising a current collector capable of being steadily combined with an electrode group and decreasing the specific resistance of a current collector. A secondary battery(100) comprises an electrode group(110), case(120), cap assembly(140) and current collector(160). The electrode group comprises a cathode(112), an anode(113) and a separator(114) interposed between the anode and the cathode. The electrode group accommodates a case. The cap assembly shuts a case tightly and has an electrode terminal. The current collector comprises collector plates(161,165) protruded with a plurality of protrusions from end part in the lateral direction and connects theelectrode group and cap assembly. The protrusions are separately formed along the end part of the collector and are inserted within the electrode group. The protrusions are inserted between protrusions of the neighboring collector plates. The uncoated area(112a) formed in anode or cathode is inserted between protrusions and is exposed between protrusions. The protrusion and uncoated areas are fixed by welding.

Description

이차 전지{RECHARGEABEL BATTERY}Secondary Battery {RECHARGEABEL BATTERY}

본 발명은 이차 전지에 관한 것으로서, 보다 상세하게는 전극군에 전기적으로 연결된 집전판의 구조를 개선한 이차 전지에 관한 것이다.The present invention relates to a secondary battery, and more particularly, to a secondary battery having an improved structure of a current collector plate electrically connected to an electrode group.

본 발명은 이차 전지에 관한 것으로서, 보다 상세하게는 전극군에 전기적으로 연결된 집전판의 구조를 개선한 이차 전지에 관한 것이다.The present invention relates to a secondary battery, and more particularly, to a secondary battery having an improved structure of a current collector plate electrically connected to an electrode group.

이차 전지(rechargeable battery)는 충전이 불가능한 일차 전지와는 달리 충전 및 방전이 가능한 전지이다. 하나의 셀로 이루어진 저용량 이차 전지의 경우, 휴대폰이나 노트북 컴퓨터 및 캠코더와 같이 휴대가 가능한 소형 전자기기에 사용된다. 복수개의 셀이 팩 형태로 연결된 대용량 이차 전지는 하이브리드 전기 자동차 등의 모터 구동용 전원으로 널리 사용되고 있다.A rechargeable battery is a battery that can be charged and discharged unlike a primary battery that is not rechargeable. Low-capacity secondary batteries consisting of one cell are used in portable electronic devices such as mobile phones, notebook computers, and camcorders. A large capacity secondary battery in which a plurality of cells are connected in a pack form is widely used as a motor driving power source for a hybrid electric vehicle.

이러한 이차 전지는 여러 가지 형상으로 제조되고 있는 데, 대표적인 형상으로는 원통형, 각형을 들 수 있다.Such secondary batteries are manufactured in various shapes, and typical shapes include cylindrical and rectangular shapes.

그리고 이러한 이차 전지는 대전력을 필요로 하는 전기 자동차 등의 모터 구동에 사용될 수 있도록 직렬로 연결되어 대용량의 이차 전지 모듈을 구성하게 된다.In addition, the secondary battery is connected in series so as to be used for driving a motor of an electric vehicle requiring a large power, thereby forming a large capacity secondary battery module.

이차 전지는 양극과 음극이 세퍼레이터(separator)를 사이에 두고 위치하는 전극군과 전극군이 내장되는 공간을 구비하는 케이스, 케이스를 밀폐하는 캡 조립체를 포함한다.The secondary battery includes a case having an electrode group in which a positive electrode and a negative electrode are positioned with a separator interposed therebetween, and a case having a space in which the electrode group is embedded, and a cap assembly sealing the case.

이차 전지가 원통형으로 형성되는 경우, 전극군의 양극 및 음극에는 활물질이 도포되지 않은 무지부가 형성되고, 양극 무지부와 음극 무지부는 서로 다른 방향을 향하도록 배치된다.When the secondary battery is formed in a cylindrical shape, a non-coating portion to which the active material is not coated is formed on the positive electrode and the negative electrode of the electrode group, and the positive electrode non-coating portion and the negative electrode non-coating portion are disposed to face in different directions.

음극 무지부에는 음극 집전판이 부착되고, 양극 무지부에는 양극 집전판이 부착되며, 음극 집전판은 케이스와 전기적으로 연결되고, 양극 집전판은 캡 조립체와 전기적으로 연결되어 외부로 전류를 유도하게 된다. 따라서 케이스는 음극 단자 역할을 하고, 캡 조립체에 설치된 캡 플레이트가 양극 단자 역할을 하게 된다. The negative electrode non-coating portion is attached to the negative electrode current collector plate, the positive electrode non-coating portion is attached to the positive electrode current collector plate, the negative electrode current collector plate is electrically connected to the case, the positive electrode current collector plate is electrically connected to the cap assembly to induce a current to the outside. Therefore, the case serves as the negative terminal, and the cap plate installed in the cap assembly serves as the positive terminal.

양극 집전판과 캡 조립체는 도전성 금속으로 이루어진 리드부재에 의하여 전기적으로 연결되는 바, 리드부재와 용접된 상태로 케이스에 끼워진다. 캡 조립체를 끼운 후에는 클램핑을 하여 캡 조립체를 케이스에 고정한다.The positive electrode current collector plate and the cap assembly are electrically connected by a lead member made of a conductive metal, and are fitted to the case while being welded to the lead member. After inserting the cap assembly, clamp the cap assembly to the case.

이와 같이 전극군과 전기적으로 연결된 집전판을 통해서 외부로 전류가 인출되므로 전극군과 집전판이 안정적으로 접촉하는 것은 매우 중요하다.Thus, since the current is drawn out through the current collector plate electrically connected to the electrode group, it is very important that the electrode group and the current collector plate are stably contacted.

또한, 고출력 전지의 경우 집전판을 통해서 대전류가 흐르므로 집전판의 고유저항이 작을수록 전력의 손실을 줄일 수 있다. 따라서 집전판의 두께를 두껍게 형성하는 것이 바람직하나, 집전판의 두께가 두꺼우면, 전극군으로 열이 잘 전달되지 않아 집전판과 전극군이 잘 용접되지 못하는 문제가 발생한다.In addition, in the case of a high output battery, a large current flows through the current collector plate, so that the loss of power can be reduced as the specific resistance of the current collector plate is smaller. Therefore, it is preferable to form the thickness of the current collector plate thickly, but if the thickness of the current collector plate is thick, heat is not transferred to the electrode group well, which causes a problem that the current collector plate and the electrode group cannot be welded well.

또한, 통상적으로 집전판과 전극군은 단순히 면접촉을 한 상태에서 용접되는데, 이러한 구조의 경우 집전판을 측방향으로 지지하는 구조가 없기 때문에 외부 충격이 가해지면 집전판과 전극군 사이의 접촉불량해지는 문제가 발생한다.Further, in general, the current collector plate and the electrode group are welded in a state of simply being in surface contact. In such a structure, there is no structure supporting the current collector plate in the lateral direction, so if an external impact is applied, the contact between the current collector plate and the electrode group is poor. Rejection problem occurs.

이와 같이 집전판과 전극군의 접촉이 불량해지면, 접촉 부위에서 저항이 커져서 이차 전지의 출력이 저하될 뿐만 아니라, 저항으로 인하여 많은 열이 발생하는 문제가 있다.As such, when the contact between the current collector plate and the electrode group is poor, not only the resistance increases at the contact portion, but also the output of the secondary battery decreases, and there is a problem in that a lot of heat is generated due to the resistance.

본 발명은 상기한 바와 같은 문제점을 해결하기 위해 안출된 것으로서, 본 발명의 목적은 전극군과 안정적으로 결합될 수 있는 집전판을 포함하는 이차 전지를 제공함에 있다.The present invention has been made to solve the above problems, an object of the present invention to provide a secondary battery comprising a current collector plate that can be stably coupled to the electrode group.

본 발명의 다른 목적은 집전판의 고유저항을 감소시켜 출력이 향상된 이차 전지를 제공함에 있다.Another object of the present invention is to provide a secondary battery having improved output by reducing the resistivity of the current collector plate.

상기와 같은 목적을 달성하기 위해 본 발명의 일 실시예에 따른 이차 전지는 양극, 음극 및 상기 양극과 상기 음극 사이에 개재되는 세퍼레이터를 포함하는 전극군과, 상기 전극군이 내장되는 케이스와 상기 케이스를 밀폐하며 전극 단자를 갖는 캡 조립체, 및 상기 전극군과 캡 조립체를 연결하며 상기 전극군에 삽입되는 집전 돌기들을 갖는 복수 개의 집전편으로 이루어진 집전판을 포함하며, 상기 집전 돌기들은 이웃하는 집전편의 집전 돌기들 사이에 끼워지고, 상기 집전 돌기들 사이에는 상기 양극 또는 음극에 형성된 무지부가 끼워진다.In order to achieve the above object, a secondary battery according to an embodiment of the present invention includes an electrode group including a positive electrode, a negative electrode, and a separator interposed between the positive electrode and the negative electrode, a case in which the electrode group is built, and the case And a current collecting plate including a cap assembly having an electrode terminal and a plurality of current collector pieces having current collector protrusions connected to the electrode group and the cap assembly and inserted into the electrode group, wherein the current collector protrusions are neighboring current collector pieces. It is sandwiched between the current collector projections of the, and between the current collector projections are sandwiched between the uncoated portion formed in the positive electrode or the negative electrode.

상기 집전편은 판형의 평판부와 상기 평판부에서 돌출된 복수 개의 집전 돌기들을 구비할 수 있으며, 상기 집전 돌기는 상기 평판부에서 상기 전극군을 향하여 경사지게 돌출된 경사부와 상기 경사부에서 상기 평판부와 평행하게 돌출된 연장부, 및 상기 연장부에서 상기 무지부를 향하여 돌출된 삽입부를 포함할 수 있다.The current collector piece may include a plate-shaped flat plate portion and a plurality of current collector protrusions protruding from the flat plate portion, and the current collector protrusion may have an inclined portion protruded obliquely toward the electrode group from the flat plate portion and the flat plate at the inclined portion. It may include an extension protruding in parallel with the portion, and an insertion portion protruding from the extension toward the plain.

상기 삽입부는 쐐기 형상으로 이루어질 수 있으며, 상기 서로 이웃하는 집전 돌기는 상기 연장부가 동일한 평면 상에 위치하도록 설치될 수 있다.The insertion portion may be formed in a wedge shape, and the neighboring current collecting protrusions may be installed such that the extension portions are positioned on the same plane.

상기 집전판은 상기 집전 돌기 사이에 상기 무지부가 끼워진 상태에서 상기 무지부와 용접으로 고정될 수 있으며, 상기 무지부는 상기 연장부와 용접으로 고정될 수 있다. 또한, 상기 집전판은 두 개의 집전편으로 이루어질 수 있다.The current collecting plate may be fixed by welding with the non-coating portion in a state where the non-coating portion is sandwiched between the current collecting protrusions, and the non-coating portion may be fixed with welding with the extension portion. In addition, the current collector plate may be formed of two current collector pieces.

상기한 바와 같이, 본 발명에 따르면 집전판에 형성된 집전 돌기가 무지부에 삽입 설치되어 집전판과 무지부가 안정적으로 고정되므로 접촉저항을 최소화할 수 있다.As described above, according to the present invention, the current collector protrusion formed on the current collector plate is inserted into the non-coated portion so that the current collector plate and the non-coated portion can be stably fixed, thereby minimizing contact resistance.

또한, 집전판과 무지부가 동일한 평면에서 용접되므로 집전판의 두께를 증가시킬 수 있으며, 이에 따라 집전판의 고유저항이 감소되므로 이차 전지의 출력이 향상된다.In addition, since the current collector plate and the non-coated portion are welded in the same plane, the thickness of the current collector plate can be increased. Accordingly, the resistivity of the current collector plate is reduced, thereby improving the output of the secondary battery.

이하, 첨부한 도면을 참조로 본 발명의 실시예에 대해 당업자가 용이하게 실시할 수 있도록 상세히 설명한다. 그러나, 본 발명은 여러가지 상이한 형태로 구현될 수 있으며 여기에서 설명하는 실시예에 한정되는 것은 아니다.Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art can easily implement the present invention. As those skilled in the art would realize, the described embodiments may be modified in various different ways, all without departing from the spirit or scope of the present invention.

도 1은 본 발명의 일 실시예에 따른 이차 전지를 도시한 절개 사시도이다.1 is a cutaway perspective view illustrating a rechargeable battery according to an exemplary embodiment of the present invention.

상기한 도면을 참조하면, 본 실시예에 따른 이차 전지(100)는 양극(112)과 음극(113)이 세퍼레이터(114)를 사이에 두고 위치하는 전극군(110)과, 전해액과 함께 전극군(110)을 수용할 수 있도록 일측 선단에 개구부가 형성된 케이스(120)를 포함한다. 그리고 케이스(120)의 개구부에는 케이스(120)를 밀봉하는 캡 조립 체(140)가 개스킷(144)을 매개로 설치된다.Referring to the above drawings, the secondary battery 100 according to the present exemplary embodiment includes an electrode group 110 in which the positive electrode 112 and the negative electrode 113 are positioned with the separator 114 interposed therebetween, and the electrode group together with the electrolyte solution. It includes a case 120 formed with an opening at one end to accommodate the (110). In addition, a cap assembly 140 for sealing the case 120 is installed at the opening of the case 120 through the gasket 144.

보다 구체적으로 설명하면, 상기 케이스(120)는 알루미늄, 알루미늄 합금 또는 니켈이 도금된 스틸과 같은 도전성 금속으로 이루어진다.More specifically, the case 120 is made of a conductive metal such as aluminum, aluminum alloy or nickel plated steel.

그리고 본 실시예에 따른 케이스(120)의 형상은 전극군(110)이 위치하는 내부 공간을 가진 원통형으로 이루어진다. 캡 조립체(140)를 케이스(120)에 끼운 후, 클램핑하여 캡 조립체(140)를 케이스(120)에 고정시키게 되는데, 이 과정에서 케이스(120)에는 비딩부(123)와 클램핑부(125)가 형성된다.And the shape of the case 120 according to the present embodiment is made of a cylindrical shape having an internal space in which the electrode group 110 is located. After the cap assembly 140 is inserted into the case 120, the cap assembly 140 is fixed to the case 120 by clamping. In this process, the beading part 123 and the clamping part 125 are attached to the case 120. Is formed.

본 실시예에 따른 전극군(110)은 양극(112)과 세퍼레이터(114) 및 음극(113)이 적층된 후, 와류상으로 감겨진 원통형 타입으로 이루어지나, 전극군(110)의 구조가 반드시 이것으로 한정되는 것은 아니고 다른 구조로도 이루어질 수 있다. 전극군(110)의 중심에는 공간이 형성되며 전극군(110)이 원통형의 형상을 유지할 수 있도록 이 공간에 센터 핀(170)이 설치된다.The electrode group 110 according to the present embodiment is formed of a cylindrical type wound in a vortex after the anode 112, the separator 114, and the cathode 113 are stacked, but the structure of the electrode group 110 must be It is not limited to this, but may be made of other structures. A space is formed at the center of the electrode group 110, and a center pin 170 is installed in the space so that the electrode group 110 can maintain a cylindrical shape.

그리고 양극(112)의 상단(도 1 기준)에는 양극 활물질이 도포되지 않은 양극 무지부(112a)가 형성되어 양극 집전판(160)과 전기적으로 연결된다. 또한, 음극(113)의 하단(도 1 기준)에는 음극 활물질이 도포되지 않은 음극 무지부(113a)가 형성되어 음극 집전판(132)과 전기적으로 연결된다.In addition, the positive electrode non-coating portion 112a is formed on the upper end of the positive electrode 112 (not shown in FIG. 1), and is electrically connected to the positive electrode current collector plate 160. In addition, a negative electrode non-coating portion 113a is formed on the lower end of the negative electrode 113 (see FIG. 1) to which the negative electrode active material is not coated, and is electrically connected to the negative electrode current collector plate 132.

캡 조립체(140)는 돌출된 외부 단자와 배기구(143a)가 형성된 캡 플레이트(143)와, 캡 플레이트(143)의 아래에 설치되며 설정된 압력 조건에서 파손되어 가스를 방출하는 벤트 플레이트(142)를 포함한다. 벤트 플레이트(142)는 설정된 압력 조건에서 전극군(110)과 캡 플레이트(143)의 전기적 연결을 차단하는 역할을 한다.The cap assembly 140 includes a cap plate 143 having a protruding external terminal and an exhaust port 143a, and a vent plate 142 installed under the cap plate 143 and broken under a set pressure condition to release gas. Include. The vent plate 142 serves to block electrical connection between the electrode group 110 and the cap plate 143 under a set pressure condition.

캡 플레이트(143)와 벤트 플레이트(142)의 사이에는 양성온도소자(positive temperature coefficient element, 141)가 설치되는 바, 상기 양성온도소자(141)는 일정 온도를 넘으면 전기저항이 거의 무한대까지 커지는 장치로서, 이차 전지(100)가 정해진 값 이상의 온도가 되었을 때, 충전 및 방전 전류의 흐름을 차단시키는 역할을 한다.A positive temperature coefficient element 141 is installed between the cap plate 143 and the vent plate 142. The positive temperature element 141 is a device in which the electrical resistance increases to almost infinity when a predetermined temperature is exceeded. As a secondary battery 100, the secondary battery 100 serves to block the flow of charge and discharge current when the temperature reaches a predetermined value or more.

벤트 플레이트(142)는 아래로 돌출된 구조로 이루어지며, 돌출된 부분의 하면에는 서브 플레이트(147)가 부착된다.The vent plate 142 is formed to protrude downward, and the sub plate 147 is attached to the bottom surface of the protruding portion.

벤트 플레이트(142)의 가장자리에는 리드부(150)를 통해서 전극군(110)과 전기적으로 연결되며 서브 플레이트(147)에 고정된 미들 플레이트(146)와 이 미들 플레이트(146)와 벤트 플레이트(142) 사이에서 미들 플레이트(146)와 벤트 플레이트(142)를 절연 시키는 절연체(145)가 설치된다.The middle plate 146 and the middle plate 146 and the vent plate 142 electrically connected to the electrode group 110 through the lead part 150 and fixed to the sub plate 147 at the edge of the vent plate 142. Insulator 145 is insulated between the middle plate 146 and the vent plate 142 between.

양극 집전판(160)은 두 개의 집전편(161, 165)이 상호 맞물린 구조로 이루어진다. 본 실시예에서는 양극 집전판을 예로서 설명하나, 본 발명이 이에 제한되는 것은 아니며, 음극 집전판도 본 실시예에 따른 양극 집전판과 동일한 구조로 이루어질 수 있다.The positive electrode current collector plate 160 has a structure in which two current collector pieces 161 and 165 are engaged with each other. In the present embodiment, a positive electrode current collector plate is described as an example, but the present invention is not limited thereto, and the negative electrode current collector plate may have the same structure as the positive electrode current collector plate according to the present embodiment.

도 2를 참조하여 집전편(161)에 대하여 자세히 살펴본다. 마주하는 두 개의 집전편(161, 165)은 동일한 구조로 이루어지므로 일측 집전편(161)에 대한 설명으로 다른 집전편(165)에 대한 설명을 대체한다.With reference to Figure 2 looks at with respect to the current collector piece 161 in detail. Since two current collector pieces 161 and 165 facing each other have the same structure, the description of one current collector 161 replaces the description of the other current collector piece 165.

집전편(161)은 평판부(162)와 평판부(162)에서 돌출된 복수 개의 집전 돌기 들(163)로 이루어진다. 집전 돌기(163)는 평판부(162)의 일측 단부에 형성되는 바, 평판부(162)의 측단에서 전방으로 돌출된 집전 돌기들(163)이 소정 간격으로 이격 형성된다. 집전 돌기(163)는 평판부(162)에서 하향 경사를 갖도록 돌출된 경사부(163a)와 경사부(163a)에 이어져 형성되며 평판부(162)와 평행하게 돌출된 연장부(163b), 및 연장부(163b)에서 수직으로 이어져 형성된 삽입부(163c)를 포함한다.The current collector piece 161 includes a flat plate portion 162 and a plurality of current collector protrusions 163 protruding from the flat plate portion 162. The current collecting protrusions 163 are formed at one end of the flat plate portion 162, and the current collecting protrusions 163 protruding forward from the side ends of the flat plate portion 162 are spaced apart at predetermined intervals. The current collecting protrusion 163 is formed to extend to the inclined portion 163a and the inclined portion 163a protruding downward from the flat plate portion 162 and the extended portion 163b protruding in parallel with the flat plate portion 162, and The insertion part 163c is formed to extend vertically from the extension part 163b.

삽입부(163c)는 양극 무지부(112a) 사이에 용이하게 끼워질 수 있도록 끝이 뾰족하게 형성되어 있다. 그리고 평판부(162)는 평평한 반원형의 판형상으로 이루어지며, 중앙에 통기공(164)을 형성하고 있다.The insertion portion 163c has a sharp pointed tip so that the insertion portion 163c can be easily inserted between the positive electrode plain portion 112a. And the flat plate portion 162 is made of a flat semi-circular plate shape, and forms a vent hole 164 in the center.

도 3에 도시된 바와 같이 두 개의 집전편(161, 165)은 평판부(162, 166)와 복수 개의 집전 돌기들(163, 167)을 포함하며, 평판부들(162, 166)에는 통기공(164, 168)이 형성되어 있다. 그리고 평판부(162, 166)에서 돌출된 집전 돌기들(163, 167)이 서로 엇갈리도록 끼워져 양극 무지부(112a)와 접촉하도록 설치된다. As illustrated in FIG. 3, the two current collector pieces 161 and 165 may include the plate portions 162 and 166 and the plurality of current collector protrusions 163 and 167, and the plate portions 162 and 166 may include a vent hole ( 164 and 168 are formed. The current collector protrusions 163 and 167 protruding from the flat plate portions 162 and 166 are inserted to alternate with each other to be in contact with the positive electrode uncoated portion 112a.

도 3은 양극 무지부(112a)에 설치된 양극 집전판(160)을 예로서 도시하고 있으나, 본 발명이 양극 집전판(160)에 한정되는 것은 아니며, 음극 집전판도 동일한 구조로 이루어질 수 있다.3 illustrates the positive electrode current collector plate 160 provided on the positive electrode non-coating portion 112a as an example, but the present invention is not limited to the positive electrode current collector plate 160, and the negative electrode current collector plate may also have the same structure.

도 4 및 도 5에 도시된 바와 같이 집전편(161, 165)은 양극 무지부(112a) 위에 설치되며, 복수 개의 집전 돌기들(163, 167)이 양극 무지부(112a) 속으로 삽입 설치된다. 그리고 두 개의 집전편(161, 165)이 서로 마주하면서 집전 돌기들(163, 167)이 상호 끼워지는데, 이에 따라 집전 돌기들(163, 167)의 연장부들(163b, 167b)이 서로 겹쳐져 동일 평면에서 평행하게 배치된다.As illustrated in FIGS. 4 and 5, the current collector pieces 161 and 165 are installed on the positive electrode non-coated portion 112a, and the plurality of current collector protrusions 163 and 167 are inserted into the positive electrode non-coated portion 112a. . The current collector protrusions 163 and 167 are fitted to each other while the two current collector pieces 161 and 165 face each other, so that the extension portions 163b and 167b of the current collector protrusions 163 and 167 overlap each other. Are arranged in parallel.

도 3을 참조하여 전극군(110)에 집전판(160)이 설치되는 과정을 살펴보면 다음과 같다.Referring to FIG. 3, the process of installing the current collector plate 160 on the electrode group 110 is as follows.

최초 하나의 집전편(161)이 양극 무지부(112a) 상에 설치되는데, 이때 집전 돌기(163)가 양극 무지부(112a) 사이를 파고든다. 집전 돌기(163)의 삽입부(163c)는 단부가 쐐기 형상으로 이루어져 양극 무지부(112a) 사이로 용이하게 파고들 수 있다.The first one current collector piece 161 is installed on the positive electrode non-coated portion 112a, at which time the current collector protrusion 163 penetrates between the positive electrode non-coated portions 112a. The insertion portion 163c of the current collecting protrusion 163 has an end portion formed in a wedge shape so that it can be easily penetrated between the positive electrode plain portion 112a.

하나의 집전편(161)이 설치되면, 이와 짝을 이루는 다른 집전편(165)이 양극 무지부(112a) 상에 설치되는데, 이때, 다른 집전편(165)의 집전 돌기들(167)은 이미 설치된 집전편(161)의 집전 돌기들(163)과 엇갈리도록 설치된다. 이때, 다른 집전편(165)의 집전 돌기들(167)이 양극 무지부(112a) 사이를 파고들면서 집전 돌기들(163, 167) 사이로 양극 무지부(112a)가 끼워져 돌출된다.When one current collector piece 161 is installed, another current collector piece 165 paired with this current collector piece 161 is installed on the positive electrode plain portion 112a, and the current collector protrusions 167 of the other current collector piece 165 are already It is installed to cross the current collector protrusions 163 of the current collector piece 161 is installed. At this time, while the current collector protrusions 167 of the other current collector piece 165 penetrate between the positive electrode plain portions 112a, the positive electrode solid portions 112a are inserted between the current collector protrusions 163 and 167 to protrude.

이와 같이 집전 돌기들(163, 167)이 양극 무지부(112a) 사이에 끼워지면, 집전판(160)이 양극 무지부(112a)와 얽혀져 양극 집전판(160)이 전극군(110)에 대하여 유동하는 것을 안정적으로 방지할 수 있다.When the current collector protrusions 163 and 167 are sandwiched between the positive electrode non-coated portion 112a, the current collector plate 160 is entangled with the positive electrode non-coated portion 112a so that the positive electrode current collector plate 160 is connected to the electrode group 110. It can stably prevent the flow.

양극 무지부(112a)가 집전 돌기들(163, 167) 사이에 끼워진 상태에서 집전 돌기들(163, 167)을 가로질러 용접을 실시한다. 이때, 집전판(160) 상에 용접라인(180)이 형성되는데, 용접라인(180)에서 집전판(160)와 양극 무지부(112a)는 동일한 평면 상에 위치하게 된다. 용접은 동일한 평면에서 평행하게 배열된 연장부들(163b, 167b)과 양극 무지부(112a) 사이에서 실시된다.Welding is performed across the current collecting protrusions 163 and 167 while the positive electrode non-coated portion 112a is sandwiched between the current collecting protrusions 163 and 167. In this case, the welding line 180 is formed on the current collector plate 160, and the current collector plate 160 and the positive electrode uncoated portion 112a are positioned on the same plane in the welding line 180. Welding is performed between the extensions 163b and 167b and the anode plain 112a arranged in parallel in the same plane.

본 실시예와 같이 양극 무지부(112a)와 양극 집전판(160)이 동일한 평면에 위치하면, 집전판(160)의 두께를 증가시키더라도 양극 무지부(112a)와 안정적으로 용접될 수 있다. 즉, 종래에는 집전판으로 레이저를 조사하고, 집전판에서 전달된 열로 무지부를 용접하므로 집전판의 두께가 지나치게 두꺼우면 집전판에서 무지부로 열이 잘 전달되지 아니하는 문제가 있었다. 그러나 본 실시예와 같이 양극 무지부(112a)가 집전 돌기들(163, 167) 사이로 돌출되면, 양극 무지부(112a)에 직접 레이저 등으로 열을 가하여 양극 무지부(112a)를 녹일 수 있으므로 집전판(160)의 두께를 두껍게 하여도 안정적으로 용접할 수 있는 이점이 있다.When the positive electrode non-coating portion 112a and the positive electrode current collector plate 160 are positioned on the same plane as in the present exemplary embodiment, the positive electrode non-coating portion 112a may be stably welded to the positive electrode non-coating portion 112a even when the thickness of the current collector plate 160 is increased. That is, in the related art, since the laser is irradiated with the current collector plate and the non-coated portion is welded by the heat transmitted from the current collector plate, if the thickness of the current collector plate is too thick, there is a problem that heat is not transferred from the current collector plate to the non-coated portion well. However, when the positive electrode non-coating portion 112a protrudes between the current collecting protrusions 163 and 167 as in the present embodiment, the positive electrode non-coating portion 112a may be directly heated with a laser or the like to melt the positive electrode non-coating portion 112a. Even if the thickness of the front plate 160 is increased, there is an advantage in that it can be stably welded.

또한, 끼워진 집전 돌기들(163, 167)이 양극 무지부(112a)를 매개로 용접되어 있으므로 집전 돌기들(163, 167)과 양극 무지부(112a)가 일체로 고정되어 집전편들(161, 165)이 외부의 충격에 의하여 유동하는 것을 방지할 수 있다. 즉, 일방이 타방에 단순히 끼워진 구조가 아니라 각 부재들이 실타래처럼 얽혀져 있으므로 더욱 안정적을 고정된다.In addition, since the fitted current collecting protrusions 163 and 167 are welded through the positive electrode plain portion 112a, the current collecting protrusions 163 and 167 and the positive electrode non-coating portion 112a are integrally fixed to each other so that the current collecting pieces 161 and 161 may be fixed. 165 may be prevented from flowing by an external impact. In other words, rather than a structure in which one is simply inserted into the other, each member is entangled like a thread and thus more stably fixed.

상기에서는 본 발명의 바람직한 실시예에 대하여 설명하였지만, 본 발명은 이에 한정되는 것이 아니고 특허청구범위와 발명의 상세한 설명 및 첨부한 도면의 범위 안에서 여러 가지로 변형하여 실시하는 것이 가능하고 이 또한 본 발명의 범위에 속하는 것은 당연하다.Although the preferred embodiments of the present invention have been described above, the present invention is not limited thereto, and various modifications and changes can be made within the scope of the claims and the detailed description of the invention and the accompanying drawings. Naturally, it belongs to the range of.

도 1은 본 발명의 일 실시예에 따른 이차 전지를 도시한 절개 사시도이다.1 is a cutaway perspective view illustrating a rechargeable battery according to an exemplary embodiment of the present invention.

도 2는 본 발명의 일 실시예에 따른 집전편을 도시한 사시도이다.2 is a perspective view showing a current collector piece according to an embodiment of the present invention.

도 3은 본 발명의 일 실시예에 따른 전극군과 이에 설치된 집전판을 도시한 부분 사시도이다.3 is a partial perspective view illustrating an electrode group and a current collector plate installed thereon according to an embodiment of the present invention.

도 4는 도 3의 전극군과 이에 설치된 집전판을 도시한 정면도이다.4 is a front view illustrating the electrode group of FIG. 3 and a current collector plate installed thereon.

도 5는 도 3의 전극군과 이에 설치된 집전판을 도시한 측면도이다.FIG. 5 is a side view illustrating the electrode group of FIG. 3 and a current collector plate installed thereon. FIG.

Claims (8)

양극, 음극 및 상기 양극과 상기 음극 사이에 개재되는 세퍼레이터를 포함하는 전극군;An electrode group including a positive electrode, a negative electrode, and a separator interposed between the positive electrode and the negative electrode; 상기 전극군이 내장되는 케이스;A case in which the electrode group is built; 상기 케이스를 밀폐하며 전극 단자를 갖는 캡 조립체; 및A cap assembly sealing the case and having an electrode terminal; And 상기 전극군과 상기 캡 조립체를 연결하며, 복수 개의 집전 돌기들이 단부에서 측방향으로 돌출된 집전편을 포함하는 집전판;A current collector plate connecting the electrode group and the cap assembly and including a current collector piece in which a plurality of current collector protrusions are laterally protruded from an end thereof; 을 포함하며,Including; 상기 집전 돌기들은 상기 집전편의 단부를 따라 이격 형성되어 상기 전극군에 삽입되고,The current collector protrusions are spaced apart along the ends of the current collector pieces and inserted into the electrode group. 상기 집전 돌기들은 이웃하는 집전편의 집전 돌기들 사이에 끼워지고, 상기 집전 돌기들 사이에는 상기 양극 또는 상기 음극에 형성된 무지부가 끼워져 상기 집전 돌기들 사이로 상기 무지부가 노출되고, 상기 집전 돌기들과 상기 무지부는 용접으로 고정된 이차 전지.The current collector protrusions are sandwiched between current collector protrusions of neighboring current collector pieces, and an uncoated portion formed at the anode or the cathode is sandwiched between the current collector protrusions to expose the uncoated portion between the current collector protrusions, and the current collector protrusions and the current collector protrusions are exposed to each other. Secondary battery is fixed to the plain by welding. 제1 항에 있어서,According to claim 1, 상기 집전편은 판형의 평판부와 상기 평판부에서 돌출된 복수 개의 집전 돌기들을 갖는 이차 전지.The current collector piece has a plate-shaped flat plate portion and a plurality of current collecting protrusions protruding from the flat plate portion. 제2 항에 있어서,The method of claim 2, 상기 집전 돌기는 상기 평판부에서 상기 전극군을 향하여 경사지게 돌출된 경사부와 상기 경사부에서 상기 평판부와 평행하게 돌출된 연장부, 및 상기 연장부 에서 상기 무지부를 향하여 돌출된 삽입부를 포함하는 이차 전지.The current collector has a secondary part including an inclined part protruding obliquely toward the electrode group from the flat plate part, an extension part protruding in parallel with the flat plate part from the inclined part, and an insertion part protruding toward the plain part from the extension part. battery. 제3 항에 있어서,The method of claim 3, wherein 상기 삽입부의 단부는 쐐기 형상으로 이루어진 이차 전지.End portion of the insertion portion is a secondary battery made of a wedge shape. 제3 항에 있어서,The method of claim 3, wherein 상기 서로 이웃하는 집전 돌기들은 상기 연장부가 동일한 평면 상에 위치하도록 설치된 이차 전지.The secondary current collectors adjacent to each other are installed such that the extension is positioned on the same plane. 삭제delete 제3 항에 있어서,The method of claim 3, wherein 상기 무지부는 상기 연장부와 용접으로 고정된 이차 전지.The non-coating portion is a secondary battery fixed to the extension by welding. 제1 항에 있어서,According to claim 1, 상기 집전판은 두 개의 집전편으로 이루어진 이차 전지.The current collector plate is a secondary battery consisting of two current collector pieces.
KR1020070097307A 2007-09-27 2007-09-27 Rechargeabel battery KR100879297B1 (en)

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DE602008002980T DE602008002980D1 (en) 2007-09-27 2008-06-06 accumulator
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US20090087735A1 (en) 2009-04-02
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EP2043180A1 (en) 2009-04-01
US7887951B2 (en) 2011-02-15

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